ADAB 686:
'A'isha said, "When the Messenger of Allah, may Allah bless him and grant him peace, saw a cloud rising from the horizon, he would leave what he was doing, even if it was the prayer, and face towards it. If Allah dispersed it, he praised Allah, and if it rained, he said, 'O Allah, make it a useful fall!'"

الأدب المفرد ٦٨٦:
عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ كَانَ رَسُولُ اللهِ ﷺ إِذَا رَأَى نَاشِئًا فِي أُفُقٍ مِنْ آفَاقِ السَّمَاءِ تَرَكَ عَمَلَهُ وَإِنْ كَانَ فِي صَلاَةٍ ثُمَّ أَقْبَلَ عَلَيْهِ فَإِنْ كَشَفَهُ اللَّهُ حَمِدَ اللَّهَ وَإِنْ مَطَرَتْ قَالَ اللَّهُمَّ صَيِّبًا نَافِعًا


Sound (Albānī)
al-Adab al-Mufrad > Supplication > § Supplication in heavy rain and ordinary rain
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